// Problem: 
// Contest: 
// URL: 
// Memory Limit: 
// Time Limit: 
// #pragma GCC optimize("Ofast")
// #pragma GCC optimize("unroll-loops")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
#include<bits/stdc++.h>
using namespace std;
#define int long long
inline int read(){
	int s=0,w=1;
	char ch=getchar();
	while(ch<'0'||ch>'9'){if(ch=='-')w=-1;ch=getchar();}
	while(ch>='0'&&ch<='9') s=s*10+ch-'0',ch=getchar();
	return s*w;
}
struct xy
{
	int x,y;
};
signed main()
{
	int t;
	cin>>t;
	while(t--)
	{
		int n,m;
		cin>>n>>m;
		xy a[n+1];
		int x=0,y=0,x1,y1;
		for(int i=0;i<n;i++)
		{
			cin>>a[i].x>>a[i].y;
			if(i==0)
			{
				x1=a[i].x;
				y1=a[i].y;
			}
			x+=a[i].x;
			y+=a[i].y;
		}
		cout<<(x-x1+m)*2+(y-y1+m)*2<<endl;
	}
	return 0;
}
